A man holding the coffee filter full of spent coffee grounds. Coffee grounds can be recycled. The spent coffee grounds can be used to produce useful things.

Swapping some of the sand in concrete for spent coffee grounds could increase the strength of concrete by nearly 30%, a new study suggests.

A whopping 2 billion cups of coffee are consumed globally every day, according to the British Coffee Association. But most of the coffee grounds end up in landfills, where the waste slowly decomposes to produce methane, a greenhouse gas 21 times more potent than carbon dioxide, according to the new study.

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